Carbureter or mixer for internal-combustion engines.



E. G. ATKINS.

OARBURETER 0R MIXER FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED JULY 8, 1909.

Patented Aug. 27, 1912.

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EDXVARD GLOVER ATKINS, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO ATKINS MANUFACTURING COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION.

CARBURETER OR MIXER FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Batented Aug. 27, 1912'.

I Application filed July 8, 1909. Serial No. 506,478.

To all whom it may concern:

Be it known that I, EDWARD GLovER A'rms s, a subject of the King of Great Britain, residing at and .whose post-office address is No. 1025 Third avenue south, Minneap olis, Hennepin county, Minnesota, have 1nvented a new and Improved Carburetor or M-xer for Internal-Combustion Engines, of which the following is a full, clear, and exact description.

My inventlon has for. its object to provide an improved carburetor. or mixing-valve for internal combustion engines and to this end it consists of the novel devices and'combinations of devices hereinafter described.

y In this improved .carbureter no liquid hydro-carbon is allowed to escape into the carburcter to form a puddle or to run over any vaporizing surface, but the parts are so arranged and the size of the oil port so regulated that the oil of hydro-carbon is instantly vaporized as it leaves said oil port,.and the oil port is automatically closed by the stopping of the engine. The oil and air feed automatically in proportion to the speed of the engine under all the varying conditions well as stationary engines.

encountered by boats and automobiles as Further a device is'provided by means of which the engineer may change the. adjustment from the usual place of control of the engine such as the steering wheel of an automobile, and this can be readily done even though the automobile is in rapid motion.

The improved carburetor is illustrated in the accompanying drawings forming a part of this specification wherein like numerals and characters indicate like parts througho1 1t the several views,

Referring to the drawings :Figure 1, is a vertical section taken centrally through the improved carbureter. Fig. 2, is a plan of the bottom of the carbureter. Fig. 3, is a. horizontal section taken through the throttle-piece on the line AA, Fig. 1, Fig. 4,

- is a sectional view of the combined oil and air shut-ofi' valves.

The mixing-chamber 1 of the carburetor is within an outer shell or casing 2, the neck on a pivot 16 on one end of its axis and'on the projection 17 from the base-piece 28 on the other end. The central portion of said revolving throttle-piece is hollowed out to form the tubular air passage 4 having a. contracted neck 5 and shaped at theend 6 so as'to be closed by the flange or diaphragm 10. Both sides of'said. neck 5" of tubular air passage 4 are cutaway immediately above the oil port 9, leaving only so much metal as is necessary to form a brace and keep the center rigid. Thus the neck 5 of the tubular air passage is entirely open to the mixing chamber. Two arms of, Said throttle-piece extend through the center of the base-piece"28 on either side of'the oil supply pipe 31' and'are fastened to the throttle control lever 23 by screws 32.

Extending from the center of the basepiece 28 through and axially of the air passage, 4, is an oil conduit, 8, terminating with a contracted port, 9, said contractedport 9 being located concentrically in the neck 5 of the air passage 4.

A shut-ofi' valve 11 is attached by a guidepiece or sleeve 12 to a diaphragm-valve or flange 10, said id's-piece or sleeve 12 having ample openings 13 for the passage of the vaporized oil or hydro-carbon. A light spring 33 tends to seat the shut-off valve 11, and at the same time close the air entrance 6.

A needle-valve 14 having a screw-threaded stem 18 regulates the contraction of the oil delivery port 9; and the end ofthe screwthreaded stem passing through the packingbox 24 is fastened to the cog Wheel 19. A toothed arm or lever 20 is plvoted on a throttle lever 23 and said toothed arm 20 is pressed into the cogs of the wheel 19 by the spring 21. A wire or cord may be attached to said toothed arm through the hole 22. so that by pulling on the wire will disengage the teeth from the cogs.

An auxiliary air valve 7 .is located at a point in the outer shell 2 so situated that air admitted through it must pass by or across the neck 5 of the main air intake pas sage 4 on its way to the engine cylinder. A spring 25, of greater tension than the spring 33, tends to close said auxiliary air valve 7. A screw 26 serves to adjust the end 29 to connect with a; ipeifrozn the tank or reservoir (not shown? tion 15 of the throttle-piece which revolves in the cylindrical center of the casing 2 is shaped like a one quarter section lengthwise of a closed cylinder having the tubular air passage 4 for its axis andis adapted to open and close the outlet for the mixture through the neck 3. The inside circumference of the cylindrical center of the casing 2 is approximately four times as great as the diameter of the exhaust or outlet assage through the neck 3. Consequently it follows that a one-quarter turn from closed position of the revolving throttle-piece will leave the outer portion thereof 15f in a position alongside the side Wall of the casing. By

' 7 reason oi the arms 15 striking the gasolene feed piper3l it can not turn more than onequarter around so it can not reach a position which would obstruct the passage of airinto the mixing chamber 1 thi'ough the auxiliary air valve 7. The closedposition of said throttle-piece 15 can be regulated by the adjustable screw-stop '30. Ihe air passage a has openingsout of the sides of the neck 5 into the mixing chamber 1.

Special emphasis is laid on the location of the oil port 9 with regard to the air intake valves at 6 and '7. Theoil port. 9 must .be nearer to the engine cylinder along the.

path traveled by the inrushing air than either oi the air entrances, and must also be as nearly in the center of the path traveled by the air from-each entrance as possible. Also the unobstructed flow of oil from the reservoir or tank through the supply pipe 31 and oil conduit 8 should continue as close up to the shut-off valve 11 as is consistent with allowing for some wear at this point. v r v Care .must be taken that thediaphra m valve or flange 10 does not seat or strike ut.

should pass freely into the. air entrance 6 in the manner (if a piston. I When the carburetor is attached to the engine and adjusted thereto and the oil supply connected at 29, its method of operation will be as follows On cranking orpthere.

wise starting the engine, the suctioni ogithe piston in the engine cylinder createsapar,

tial vacuum in the mixing-chamber}, and this vacuum immediately causes thediaphragm valvelO to open and with it the oil shut-ofl' valvell. At the same instant it causes aquick rush of air through the air passage l, which, by reason of the shape of the passageand. the location of the oil port 9, is deflected. across said oil port 9 sucking out and vaporizing all the oil allow d to pass through the contracted port 9. The openings 13' in the guide-piece or sleeve 12 are large enough and so'placed as not to intcrfere with this action. The quantity of oil which can be thus sucked out is limited 'dIhe outer porand regulated by the action of the needlevalve 14 in the contracted port 9. .As the throttle 15 is turned to openwider thejcogwheel 19 being in mesh With-the toothed arm opened the greater suction force is exercised on the air intake valves and an increasmg volume of a1r 1s drawn in, all of WhlCh rushes by the oil port 9, picking up and vaporizing theoil on the way. Closing the throttle reverses the process, that is to say less air and less oil is admitted and the moment the engine stops the shut-ofi valve 11 and the flanged extension or diaphragm valve 10 are pushed back to their normal j position by the spring 33. If it is desired at any time to change the oil feed, it can be done by disengaging the toothed arm 20 from the cog-wheel. l9 and turning the throttle independently either way according -to whether an increase ordecrease of oil is desired and then allowing the toothed arm 20 to again spring back to v engage the cog tact. y The shape of parts may be varied so long as the proper relation of the same to each other is maintained; and consequently I do not limit myself to the precise details of construetion hereinbefore enumerated.

Having thus described the invention, what Iolaim and desire to secure by, Letters Patwheel at a new point of .con-

1. In a carburetor, the, combination with rob a casing or mixing chamber, of a main air intake passage having a contracted neck at the end which opens into said mixing chamber andopemn'g at the other end to the atmosphere,. a yieldingly closed auxiliary air intake valve opening into said mixing chamber and arranged to be opened by suction and so placed that the air admitted must pass over or by the open neck or" the main air intake passage, an oil supply conduit having a contracted port and unobstrueted'except at said contracted port, the

said contracted oil delivery port being located in the contracted neck of said-main air intake passage and well above the open and communicating with the atmosphere,

and two valves cooperating with said oil delivery port, the one serving to regulate thecontraction of said port, and the other being actuated by suction and serving to open and close the oil port and having a flanged extension which serves to open and close the end of the main air passage simultaneously with the opening and closing of the oil port.

2. In a carburetsr, the combination of a throttlepiece segving to control the passage oi'the mixture out of the carburetor, with ,its point of contact on the screw-threadedneedle valve or to disengage it from any contact whatsoever.

3. In a carbureter, th; combination with a casing or mixing valve, of a main air intake passage having a contracted neck at the end which opens into said mixing chamher and opening at the other end to the atmosphere, a yieldingly closed auxiliary air intake valve opening into said mixing chamber and arranged to be opened by suction and so placed that the air admitted must pass over or by the open neck of the.

main air intake passage, an oil supply conduit having a contracted port and unobstructed except at said contracted port, the said contracted oil delivery port being located in the contracted neck of said main air intake passage and well above the open end communicating with the atmosphere, two valves cooperating with said oil delivery port, the one serving to regulate the contraction of said port, and the other being. actuated by suction and serving to open and'close the said oil port, and having a flanged extension which serves to open and .close the end of the main air passage simultaneously with the opening and closing of the oil port, a throttle piece serving to con trol the outlet of the mixture from the carbureter, a screw-threaded stem on the needle valve serving to regulate thecontraction of the oil delivery port, a connection between said screw-threaded-needle valve and said throttle piececausing said needle valve to turn in likeproportion to the throttle, and means for'moving said connection at a 'dist ance from the carbureter so as to change its point of contact on the screw-threadedneedle-valve.

4'. In a carbureter, the combination, with a casing or mixing chamber, of a main air intake passage having a contracted neck at the end which opens into said mixing chamher and opening at the other end to the atmosphere, a yieldingly closing auxiliary air intake Valve opening into said mixing chamber and arranged to be opened by suction and so placed that the air admitted must pass over or by the main air intake.

passage, an oil supply conduit having a contracted port and unobstructed except at said contracted'port, the said contracted oil delivery port being located in the contracted neck of said main air intake passage and well above the openend communicating} with the atmosphere,.two valves cooperating with said oil delivery port, the one serving to regulate the contraction of said port and the other being actuated by suction and serving to open and close the said oil port and having a flanged extension which serves to open and close the end-of the main air passage'simultaneously with the opening and closing ofthe oil-port, a throttle piece serving tocontrolthe outlet of the mixture from-the carbureter,a screw thread on the stem of the needle valve which serves to regulate the contraction of the oil admission port, a cog wheel attached to said screw-threaded-valve-stem, a toothed arm to engage the cogs and connect said throttle piece to said screw-threaded-valve-stem, said toothed arm being normally pressed into position by a spring, substantially as shown and described. v I

In testimony-whereof I have hereunto set my hand in the presence of two witnesses; EDWARD. GLOVER ATKINS.

Witnesses:

. E. HURSTMAN,. v G. B. DAY,

Copies of this patent maybe obtained for five cents each, by addressinglthe f Commissioner of Patents.

'Washington,D.. C, 

